1 /* 2 * Copyright © 2012 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27 #ifndef HB_SHAPER_PRIVATE_HH 28 #define HB_SHAPER_PRIVATE_HH 29 30 #include "hb-private.hh" 31 32 typedef hb_bool_t hb_shape_func_t (hb_shape_plan_t *shape_plan, 33 hb_font_t *font, 34 hb_buffer_t *buffer, 35 const hb_feature_t *features, 36 unsigned int num_features); 37 38 #define HB_SHAPER_IMPLEMENT(name) \ 39 extern "C" HB_INTERNAL hb_shape_func_t _hb_##name##_shape; 40 #include "hb-shaper-list.hh" 41 #undef HB_SHAPER_IMPLEMENT 42 43 struct hb_shaper_pair_t { 44 char name[16]; 45 hb_shape_func_t *func; 46 }; 47 48 HB_INTERNAL const hb_shaper_pair_t * 49 _hb_shapers_get (void); 50 51 52 /* For embedding in face / font / ... */ 53 struct hb_shaper_data_t { 54 #define HB_SHAPER_IMPLEMENT(shaper) void *shaper; 55 #include "hb-shaper-list.hh" 56 #undef HB_SHAPER_IMPLEMENT 57 }; 58 59 #define HB_SHAPERS_COUNT (sizeof (hb_shaper_data_t) / sizeof (void *)) 60 61 /* Means: succeeded, but don't need to keep any data. */ 62 #define HB_SHAPER_DATA_SUCCEEDED ((void *) +1) 63 64 /* Means: tried but failed to create. */ 65 #define HB_SHAPER_DATA_INVALID ((void *) -1) 66 #define HB_SHAPER_DATA_IS_INVALID(data) ((void *) (data) == HB_SHAPER_DATA_INVALID) 67 68 #define HB_SHAPER_DATA_TYPE_NAME(shaper, object) hb_##shaper##_shaper_##object##_data_t 69 #define HB_SHAPER_DATA_TYPE(shaper, object) struct HB_SHAPER_DATA_TYPE_NAME(shaper, object) 70 #define HB_SHAPER_DATA_INSTANCE(shaper, object, instance) (* (HB_SHAPER_DATA_TYPE(shaper, object) **) &(instance)->shaper_data.shaper) 71 #define HB_SHAPER_DATA(shaper, object) HB_SHAPER_DATA_INSTANCE(shaper, object, object) 72 #define HB_SHAPER_DATA_CREATE_FUNC(shaper, object) _hb_##shaper##_shaper_##object##_data_create 73 #define HB_SHAPER_DATA_DESTROY_FUNC(shaper, object) _hb_##shaper##_shaper_##object##_data_destroy 74 #define HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) hb_##shaper##_shaper_##object##_data_ensure 75 76 #define HB_SHAPER_DATA_PROTOTYPE(shaper, object) \ 77 HB_SHAPER_DATA_TYPE (shaper, object); /* Type forward declaration. */ \ 78 extern "C" HB_INTERNAL HB_SHAPER_DATA_TYPE (shaper, object) * \ 79 HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (hb_##object##_t *object HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS); \ 80 extern "C" HB_INTERNAL void \ 81 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (HB_SHAPER_DATA_TYPE (shaper, object) *data); \ 82 extern "C" HB_INTERNAL bool \ 83 HB_SHAPER_DATA_ENSURE_FUNC (shaper, object) (hb_##object##_t *object) 84 85 #define HB_SHAPER_DATA_DESTROY(shaper, object) \ 86 if (HB_SHAPER_DATA_TYPE (shaper, object) *data = HB_SHAPER_DATA (shaper, object)) \ 87 if (data != HB_SHAPER_DATA_INVALID && data != HB_SHAPER_DATA_SUCCEEDED) \ 88 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); 89 90 #define HB_SHAPER_DATA_ENSURE_DEFINE(shaper, object) \ 91 HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, true) 92 93 #define HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(shaper, object, condition) \ 94 bool \ 95 HB_SHAPER_DATA_ENSURE_FUNC(shaper, object) (hb_##object##_t *object) \ 96 {\ 97 retry: \ 98 HB_SHAPER_DATA_TYPE (shaper, object) *data = (HB_SHAPER_DATA_TYPE (shaper, object) *) hb_atomic_ptr_get (&HB_SHAPER_DATA (shaper, object)); \ 99 if (likely (data) && !(condition)) { \ 100 /* Drop and recreate. */ \ 101 /* If someone dropped it in the mean time, throw it away and don't touch it. \ 102 * Otherwise, destruct it. */ \ 103 if (hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), data, nullptr)) { \ 104 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \ 105 } \ 106 goto retry; \ 107 } \ 108 if (unlikely (!data)) { \ 109 data = HB_SHAPER_DATA_CREATE_FUNC (shaper, object) (object); \ 110 if (unlikely (!data)) \ 111 data = (HB_SHAPER_DATA_TYPE (shaper, object) *) HB_SHAPER_DATA_INVALID; \ 112 if (!hb_atomic_ptr_cmpexch (&HB_SHAPER_DATA (shaper, object), nullptr, data)) { \ 113 if (data && \ 114 data != HB_SHAPER_DATA_INVALID && \ 115 data != HB_SHAPER_DATA_SUCCEEDED) \ 116 HB_SHAPER_DATA_DESTROY_FUNC (shaper, object) (data); \ 117 goto retry; \ 118 } \ 119 } \ 120 return data != nullptr && !HB_SHAPER_DATA_IS_INVALID (data); \ 121 } 122 123 124 #endif /* HB_SHAPER_PRIVATE_HH */ 125